Darn Tough is so confident in their products that they back up their products with an unconditional lifetime guarantee. This sock has earned a place in the hearts of many a discerning hiker because of its dependability. Cushioning along the bottom of the foot provide the perfect amount of support while a smooth, performance fit assures there’s no slipping, no bunching, and no blisters. Fine gauge knitting makes this Merino Wool sock supremely comfortable, breathable and fast drying. This "all-weather" sock stays cool in the summer and warm in the winter plus it’s naturally antimicrobial so it repels bacteria and odor.